Polymorphic lithium-silicon compound for use in pure silicon anode of lithium-ion battery and use thereof
US12374685B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 12, 2019 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Oct 5, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A polymorphic lithium-silicon compounds for use in pure silicon anode of lithium-ion battery and use thereof are provided. The pure silicon anode includes nucleuses which have one or more structures of Li4.1Si_Cmcm, Li13Si4_Pbam, Li2Si_C12m1, and LiSi_I41/AZ. It was generally believed Li4.1Si_Cmcm to be a high-temperature stable phase, not presenting at room temperature or in the pure silicon anode of lithium-ion battery, but this present invention proves that Li4.1Si_Cmcm can exist in the disclosed material. After lithiation process, the pure silicon anode can have a structure of one or more of Li4.1Si_Cmcm, Li13Si4_Pbam, Li2Si_C12m1, and LiSi_I41/AZ, with extremely improved capacity. The present disclosure may increase the electrical capacity of the pure silicon anode in actual use and solve the problem of the existing pure silicon anode that the volume expansion after repeated lithiation and delithiation leads to electrode damage and battery failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.